test(ivy): introduce route testing mode for ngtsc tests (#27697)

This commit introduces a new mode for the NgtscTestEnvironment which
builds the NgtscProgram and then asks for the list of lazy routes,
instead of running the TS emit phase.

PR Close #27697

packages/compiler-cli/test/ngtsc/BUILD.bazel

@@ -7,6 +7,7 @@ ts_library(
     deps = [
         "//packages/compiler",
         "//packages/compiler-cli",
+        "//packages/compiler-cli/src/ngtsc/routing",
         "//packages/compiler-cli/test:test_utils",
         "@ngdeps//typescript",
     ],